Walker pinned Northview‚Äôs Maddy Tyrone to accomplish the feat.
This was Walker‚Äôs third finals appearance. She placed second her first trip in 2011 before her recent titles.
Tyrone was the only wrestler who has defeated Walker since 2011.
“Jessica came out with tremendous focus and wrestled her best,” said Marisa Silvestri, Samohi‚Äôs athletic director. “It was a great night for her.”